GB1237820A - A high speed delta modulation system - Google Patents
A high speed delta modulation systemInfo
- Publication number
- GB1237820A GB1237820A GB38090/69A GB3809069A GB1237820A GB 1237820 A GB1237820 A GB 1237820A GB 38090/69 A GB38090/69 A GB 38090/69A GB 3809069 A GB3809069 A GB 3809069A GB 1237820 A GB1237820 A GB 1237820A
- Authority
- GB
- United Kingdom
- Prior art keywords
- subtractor
- modulator
- delta
- multiplexed
- sampled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/06—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation
- H04B14/062—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using delta modulation or one-bit differential modulation [1DPCM]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
1,237,820. Delta modulation. NIPPON ELECTRIC CO. Ltd. 29 July, 1969 [6 Aug., 1968], No. 38090/69. Heading G4H. A series of N delta modulators connected so that each receives at its input the error signal from the subtractor of the previous modulator are sampled at a frequency #, the output pulses from the delta modulators being multiplexed on to a single lead so that the conversion is equivalent to a single delta modulator sampled at a frequency N#. As described N=2 the error signals from the subtractor 13 (Fig. 2) of the first modulator being fed to the subtracter 23 of the second modulator each positive or negative pulse (depending on the polarity of the subtractor outputs) from encoders 11, 21 being converted by multiplexer 31 into non-return to zero signals and multiplexed into first and second time slots respectively on an output lead 8. At the receiver the input signal to the subtractor 13 is reconstructed using a single integrator.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP43055290A JPS4839505B1 (en) | 1968-08-06 | 1968-08-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1237820A true GB1237820A (en) | 1971-06-30 |
Family
ID=12994436
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB38090/69A Expired GB1237820A (en) | 1968-08-06 | 1969-07-29 | A high speed delta modulation system |
Country Status (3)
Country | Link |
---|---|
US (1) | US3594509A (en) |
JP (1) | JPS4839505B1 (en) |
GB (1) | GB1237820A (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3681756A (en) * | 1970-04-23 | 1972-08-01 | Industrial Research Prod Inc | System for frequency modification of speech and other audio signals |
US3750024A (en) * | 1971-06-16 | 1973-07-31 | Itt Corp Nutley | Narrow band digital speech communication system |
FR2211169A5 (en) * | 1972-12-15 | 1974-07-12 | Sle Citerel Lannion Elec | |
JPS50123912U (en) * | 1974-03-26 | 1975-10-09 | ||
JPS52116103A (en) * | 1976-03-26 | 1977-09-29 | Kokusai Denshin Denwa Co Ltd | Multistage selection dpcm system |
JPS557475U (en) * | 1978-06-29 | 1980-01-18 | ||
IL70134A (en) * | 1983-11-04 | 1984-12-31 | Fibronics Ltd | Data communication system using unipolar pulses |
US5150120A (en) * | 1991-01-03 | 1992-09-22 | Harris Corp. | Multiplexed sigma-delta A/D converter |
US6104991A (en) * | 1998-02-27 | 2000-08-15 | Lucent Technologies, Inc. | Speech encoding and decoding system which modifies encoding and decoding characteristics based on an audio signal |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2949505A (en) * | 1957-08-14 | 1960-08-16 | Bell Telephone Labor Inc | Reduced bandwith transmission system |
US3471648A (en) * | 1966-07-28 | 1969-10-07 | Bell Telephone Labor Inc | Vocoder utilizing companding to reduce background noise caused by quantizing errors |
NL151593B (en) * | 1966-11-22 | 1976-11-15 | Philips Nv | SYSTEM FOR SIGNAL TRANSMISSION USING PULSE DIVISION MODULATION. |
-
1968
- 1968-08-06 JP JP43055290A patent/JPS4839505B1/ja active Pending
-
1969
- 1969-07-29 GB GB38090/69A patent/GB1237820A/en not_active Expired
- 1969-08-05 US US847622A patent/US3594509A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US3594509A (en) | 1971-07-20 |
JPS4839505B1 (en) | 1973-11-24 |
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